Study on Complexity-Reduced Iterative Equalization Algorithm for Mobile OFDM  

作　　者：XI Xiaoping ZHANG Can 

机构地区：[1]School of Information Sciences and Engineering, Graduate University of Chinese Academy of Sciences, Beijing 100049, China [2]State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences, Beijing 100049, China [3]Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, China

出　　处：《Chinese Journal of Electronics》2009年第1期120-124,共5页电子学报（英文版）

摘　　要：In high mobility Orthogonal-frequency division multiplexing （OFDM） systems, time-varying channels destroy the orthogonality among subcarriers and the resultant Intercarrier interference （ICI） degrades the receiver performance. To obtain an effective balance of performance and complexity at the receiver, we proposed to split the Channel frequency response （CFR） matrix into a sequence of submatrices rather than using the whole CFR matrix. Then, we derived a soft information based sequentially iterative Minimum mean square error （MMSE） equalizer, which fully exploits the ICI distribution property. Analysis and simulations demonstrate that this scheme provides a flexible and controllable approach to trade off performance for complexity, since it can be simply done by choosing different size of the parameter Q. Meanwhile, superior ability of the ICI suppression is maintained when compared with previous equalization schemes. This feature indicates its potential application for future wireless communications.

关 键 词：Orthogonal frequency division multiplexing （OFDM） Time-varying channel Intercarrier interference （ICI） Iterative equalization Minimum mean square error （MMSE） 

分 类 号：TN929.5[电子电信—通信与信息系统] TN911.5[电子电信—信息与通信工程]